tire pressure
 

Just looking for opinions on what ppl set there tire pressure at. I do some highway driving and alot of around town driving. Right now I have them set at 29/35psi cold. Once warm usually rise to 32-33/38-39psi. Sound about right?

I leave mine at factory settings and monitor the TPMS for correct pressures when cold. All the effort going into changing them for driving other than tracking is not what I want to do. Even if I'm going to do some spirited driving on the back roads, I just leave them as is.

Factory setting for half load - 34/40.

I run mine lower than most at 33/37 cold at 68 degrees ambient temp.

Kurtis,

I tried 29 and 35 because I felt my tires were getting too loud, and I noticed a bit more tire wear. Now I like 33 and 39 (1 psi below 997.1S recommended* partially loaded pressures) as a good balance of noise, handling, and tire wear. I am running Pirelli P-Zeros, 235/25-19 F, 295/30-19 R.

* Correction: For future reference, the 997.1 owner's manual states that the recommended partially loaded pressures are indeed 33 psi Front and 39 psi Rear. The 997.2 owner's manual states that the recommended partially loaded pressures are 34 psi Front and 40 psi Rear. In my case, recommended 997.1 pressures were ideal (not 1 psi below recommended, as I stated above).

So that is the air pressure you fill the tires at when there cold? Thanks everyone for chiming in.

Michelin recommends 36/44 for the PS2 on a 997. 29/35 is definitely underinflated. You would risk wheel damage if you hit any sharp bumps or holes, and wear would be uneven.

Fill with nitrogen to keep pressures more stable.

33/37 cold PSS on c4S. Same tire PSS 29/32 cold on GT3
Depends on tire and car.

Okay cool right on thanks. I'm gonna give that a go and see what I think
33/37 cold

I had read somewhere (here or on rennlist) that gary sims (simsgw) preferred 34/37.

Right on thanks

Michelin most likely recommends 36/44 because that is Porsche's recommendation for full load conditions on the 997. Michelin doesn't want to get sued by some owner because they recommended pressures lower than Porsche's recommended pressure for maximum load, and the guy goes out and has a tire blow out on him.

I agree that 29/35 is under inflated, although I think Porsche has a "comfort" recommended pressure for the 991 of 29/32. How the times have changed. Who would have thought that Porsche would make a 911 with a tire pressure setting of "comfort."

I adjusted mine this morning following the owners manual. For a 2008 C2 with 19 inch wheels and a partial load (usually me by myself), it is 33/39.

I had a similar thread about this very same question, and I found that 33/39 is the best setting for me. I went out and bought a $40 tire pressure gauge, and it makes a difference! There is a huge disparity between the lower quality gauges and the good one. The tpc evens out after some good highway driving, but it reads off when I first start driving and up until I get good highway driving in for a bit. Having it measured even, and cold at that setting gives me great comfort. I'll increase it if I ever have need to increase my weight load, but I can't see why I would.